Crank

ABSTRACT

Disclosed is a driving device for imparting rotary motion to a driven member, said driving device comprising a body supporting a rotatable cylinder at one end thereof. The other end of the body includes a rotatable handle extending from the body along an axis parallel to the axis of the rotatable cylinder. An internal passageway is provided in the body in which a reciprocable pin member is disposed. The end of the pin member adjacent the rotatable cylinder is provided with teeth adapted to enter recesses defined in the external surface of the cylinder so as to lock the cylinder against rotation relative to the body when the pin is in a first position. A camming piston is reciprocably supported in the body adjacent the handle. The axis of the camming piston is parallel to the axis of the handle. A pivotal lever is carried by the handle and is provided with a cam ring adapted to abut the camming piston. Pivotal movement of the lever produces reciprocable movement of the camming piston which abuts the reciprocable pin to produce movement of the pin thereby locking the cylinder against rotation relative to the body. Spring means are provided in the linkage normally to bias the teeth out of engagement with the recesses so that the cylinder is normally rotatable in the absence of actuation of the handle lever.

United States Patent [72] Inventor Harry G. Dodge Painesville, Ohio [21Appl. No. 775,021 [22] Filed Nov. 12, 1968 [45] Patented Sept. 7, 1971[73] Assignee Crawford Fitting Company Solon, Ohio {54] CRANK 15 Claims,7 Drawing Figs.

52 0.5. CI 74/548 [51} Int. Cl 605g 1/00 [501 Field of Search 74/545,546, 547,548,112

[56] References Cited UNITED STATES PATENTS 1,343,531 6/1920 Tennyson74/548 2,156,200 4/1939 Smyers 74/548 Primary Examiner-William F. O'DeaAssistant ExaminerWesley S. Ratliff, Jr. Att0rneyFay, Sharpe andMulholland ABSTRACT: Disclosed is a driving device for imparting rotaryt motion to a driven member, said driving device comprising a bodysupporting a rotatable cylinder at one end thereof. The other end of thebody includes a rotatable handle extending from the body along an axisparallel to the axis of the rotatable cylinder. An internal passagewayis provided in the body in which a reciprocable pin member is disposed.The end of the pin member adjacent the rotatable cylinder is providedwith teeth adapted to enter recesses defined in the external surface ofthe cylinder so as to lock the cylinder against rotation relative to thebody when the pin is in a first position. A camming piston isreciprocably supported in the body adjacent the handle. The axisof thecamming piston is parallel to the axis of the handle. A pivotal lever iscarried by the handle and is provided with a cam ring adapted to abutthe camming piston. Pivotal movement of the lever produces reciprocablemovement of the camming piston which abuts the reciprocable pin toproduce movement of the pin thereby locking the cylinder againstrotation relative to the body. Spring means are provided in the linkagenormally to bias the teeth out of engagement with the recesses so thatthe cylinder is normally rotatable in the absence of actuation of thehandle lever.

PATENTED SEP 7 1971 SHEET 1 OF 2 FIG.2

INVENTOR. HARRY G. DODGE BY if d r/ n ATTORNEYS.

CRANK BACKGROUND OF THE INVENTION This invention relates to a drivingdevice for imparting rotary motion to a driven member. While theinvention is broadly applicable as a tool for imparting rotary motion tomachine elements such as shafts, screws, bolts, and other similarelements, the preferred embodiment of this invention will be describedwith reference to a tube bender and in particular with reference to acrank for rotating the forming roll or mandrel of a tube bender.

Hand operated tube bending tools are well known to the art. As anexample of such a tool, reference is made to U.S. Pat. No. 3,236,082 toBeck et al. As shown in the Beck et al. patent, a squared crank armwhich carries a hand grasp roller at its outer end is nonrotatablyreceived in a recess of a stub shaft to which is secured a bevel gear.Rotation of the crank arm about the stub shaft axis produces rotation ofthe bevel gear thereby imparting rotation to a forming roll of the tubebender. Because the crank arm is nonrotatably secured to the gear trainwhich produces rotation of the forming roll, any rotation of the crankarm will produce a corresponding rotation of the forming roll.Inversely, any rotation of the forming roll will produce a rotation ofthe crank arm. This fixed relationship of the crank arm and the formingroll can be a hindrance to the operator of the tube bending tool.Generally, when not cranking, the operator of a tube bending tooldesires that the crank arm be disposed in a downward position for anumber of reasons. When tubing is installed in the tube bending tool orremoved therefrom, the operator frequently desires to rotate the formingroll manually to orient the roll with respect to the tube. With atube-bending tool such as is shown in the Beck et al. patent, a manualrotation of the forming roll will produce a rotation of the crank armwhich rotation tends to interfere with the operator. Further, the weightof the crank arm renders manual manipulation of the fonning roll moredifficult.

The driving device of this invention, when used as a crank arm for atube-bending tool, provides a releasble connection between the crank armand the forming roll permitting independent rotation of the forming rollwithout rotation of the crank arm. Further, the crank arm of thisinvention, under the influence of gravity, is normally in a downwardposition when assembled to the tube-bending tool thereby to avoidinterference with the operator.

For a more complete description of the driving device of this invention,reference is now made to the accompanying figures in which:

FIG. 1 is an elevational view, partly in section, of a tube bending toolincorporating the driving device of this invention as a crank armthereof;

FIG. 2 is an enlarged sectional view taken along the line 2 2 of FIG. 1;

FIG 3 is an enlarged sectional view of the upper portion of FIG. 2showing the rotatable cylinder of this invention in greater detail;

FIG. 4 is a sectional view taken along the line 4-4 of FIG.

FIG. 5 is a sectional view taken along the line 55 of FIG.

FIG. 6 is an enlarged sectional view of the bottommost portion of FIG. 5and showing in greater detail the handle grip of this invention;

FIG. 7 is a sectional view taken along the line 77 of FIG. 5.Description of the Invention Reference is now made to FIG. 1 whereinthere is shown a tube-bending tool in which the driving device of thisinvention is utilized as a crank arm. The tube bending tool is comprisedof a base 11 and a coverplate 12 which is secured to the base by meansof cap screws (not shown) or the like. The base 11 has depending fromits bottom, centrally thereof, a block 14 with flat faces 15 to whichmay be applied the jaws of a vice (not shown) for holding the tool on abench or preferably, on a single column to provide space for compoundangle bending. The base member 11 and coverplate 12 provide an annularspace 16'for housing the bevel gears 17 and 18. The gear 17 is fixed tothe inner end of a stub shaft or crank shaft 19 by means of a key 20.Alternately, the gear 17 may be fixed to the stub shaft by means of apin. The shaft 19 is journaled in the sidewall of the base member asbest shown in FIG. 1; its outer end is provided with a hex surface 21(FIG. 2) for receiving the free end of a crank arm 22.

Gear 18 is rotatably supported by the stub shaft 23 which has its lowerend journaled in the bottom of the base as indicated at 24'. The hub ofgear 18 is fixed to the shaft 23 by means of a pin (not shown) such thatrotation of the stub shaft 23 will be transmitted to gear 18 and viceversa. The hub of gear 18 is journaled in'the coverplate 12, asindicated at 27, to provide support for the gear.

The shaft 23 extends above the coverplate 12 and the forming roll 28 isfixed thereon by means of a spline or key (not shown). The outer end ofthe stub shaft 23 includes a hex surface 29 similar to the hex surface21 of the crank shaft 19. In the event that it is inconvenient to turnthe gear 17 by means of the crankshaft 19, the crank arm 22 may beremoved from the crankshaft 19 and positioned on the stub shaft 23 atthe hex surface 29.

The forming roll 28includes an annular groove 30 for the purpose ofreceiving a tube 31. As is shown in FIG. 1, tube 31 is supported withinthe forming roll groove 30 by means of a tube clamp 32 including ahandle portion 33 and a V-shaped supporting surface 34.

In a tube-bending operation, the tube is first clamped into position inthe groove 30 of the forming roll 28. The crank arm 22 is then rotated,rotating bevel gear 17 and bevel gear 18. Because bevel gear 18 isnonrotatably secured to stub shaft 23, rotation of bevel gear 18produces rotation of the forming roll 28. A bending force is thusimparted to the tube 31. For a more complete description of theoperation of a tube bending tool, reference is made to beck et al. U.S.Pat. No. 3,236,082. This invention is directed to the driving device orcrank arm 22 for imparting rotary motion to the crankshaft 19 or,alternately, to the stub shaft 23 by means of the hex surface 29.

As is more clearly shown in FIG. 2, the driving device of this inventioncomprises a body 35 having a bore 36 and counterbores 37, 38 and 39.Rotatably supported at one end of body 35 is a cylinder 40 having aplurality of teeth 41 in the external surface thereof. Teeth 41 define aplurality of recesses 42 for a purpose to be described more fullyhereafter. A passageway extends through the cylinder 40, the walls ofsaid cylinder defining said passageway being generally hex-shaped andcomplementary to the hex-shaped external surface of the crankshaft 19.Thus, when crankshaft 19 is received within the passageway of thecylinder 40, the cylinder and the crank shaft 19 are nonrotatablysecured to one another.

This invention should not be considered limited to the hexshapedconstruction of the crankshaft l9 and the internal walls of therotatable cylinder 40, as other structures well known to those skilledin the art may be used to secure the crankshaft 19 to the cylinder 40 ina nonrotatable relationship.

Slidably received within the counterbore 37 of the body 35 is acylindrical pin or shaft 43. Pin 43 includes a cylindrical projection 44slidably disposed in bore 36. A compression spring 45 is disposed aboutthe cylindrical projection 44 so as to abut the end shoulder of pin 43and the radial wall of body 35 defining the counterbore 37. The purposeof the compression spring 45 will be described more fully hereafter. Theend of the cylindrical projection 44 is threaded at 46 for reception ina tapped hole of carrier 47. Pivoted on tube carrier 47 by means of pin48 is a pawl 49 including teeth 50 thereon. As shown in FIG. 2., teeth50 are adapted to be received within recesses 42 of cylinder 40. Pin 48permits pawl 49 to pivot slightly about the pin axis as the pawl engagescylinder 40.

This invention should not be considered as limited to the pawlconstruction of FIG. 2 as it is contemplated that the teeth 50 may beprovided directly on the end surface of the carrier 47 or, alternately,the teeth 50 should be provided directly on an enlarged head of thecylindrical projection 44. The construction of FIG. 2 permits a certaindegree of flexibility in the pawl 49 providing unrestrained movement ofteeth 50 into recesses 42 in virtually any orientation of cylinder 40.The threaded interconnection of the cylindrical projection 44 and thecarrier 47 aids in the assembly of the driving device of this inventionas will be described more fully hereafter.

As is shown in FIG. 5, the cylinder 40 is free to rotate within a firstend of the body 35, while being retained against axial displacement bymeans of a snap ring 51 and a coverplate 52 (FIGS. 4 and Coverplate 52also permits access to the pawl 49, pin 48, and carrier 47. Thecoverplate may be secured to the body 35 by any suitable fastening meanssuch as screws extending through the coverplate and threaded into thetapped.

holes 53 in the body 35 (FIG. 3).

As has been previously pointed out, the cylindrical pin 43 is slidablyreceived within the counterbore 37 of the body 35. As seen in FIG. 5,the cylindrical pin 43 extends into a second-end portion of the body 35where said pin abuts a camming piston 54. Camming piston 54 includes agenerally cylindrical external surface 55 slidably received within acounterbore 56 of body 35. A cylindrical shoulder 57 of lesser diameterthan the cylindrical surface 55 is defined at one end of the cammingpiston. A generally frustoconical camming surface 58 is disposed betweenshoulder 57' and cylindrical surface 55. Camming piston 54 furtherincludes a bore 59 and a counterbore 60 which receives a compressionspring 61. As is shown in FIG. 5, camming piston 54 is slidably receivedin counterwith respect to piston 54. While rotating, however, nose 74may still actuate piston 54.

bore56 of body 35. A cylindrical connector element 62 is I disposedwithin the bore 59 of the camming piston. Cylindrical connector element62 includes a flange or shoulder 63 fixed thereto. Shoulder 63 isadapted to abut an internal radial wall surface of body when an end ofthe connector element is disposed within a bore 64 of body 35. A washer65'is received in a counterborc of the body 35. Screw 64a is threadedlyreceived in a tapped hole at one end of the connector element 62 and incooperation with washer 65 permits connector element 62 to rotate withrespect to body 35 while disposed in bore 64. A compression spring 61 isdisposed within counterbore 60 of the camming piston 54 and is adaptedto abut shoulder 63 and a radial wall of camming piston 54 defining thecounterbore 60. The purpose of spring 61 will be described more fullyhereafter.

Attached to the body 35 by means of the connector element 62 and screw67 is a handle grip 66. Handle grip 66 comprises a generally cylindricalelement 68 including a laterally opening slot or recess 69 whichreceives a pivotal lever 70. As is shown in FIG. 5, element 68 mayinclude an internal flat portion 71 at the bottom of recess 69, andwhich serves as an anchoring surface for one end of connector element62. A

washer '72 is interposed between the element 68 and the body 35 toreduce friction between the opposed relatively rotatable surfaces ofhandle grip 66 and crank body 35.

It will be seen from FIG. 5 that handle grip 66 including element 68,lever 70 and connector 62 is free to rotate with respect to body 35about the axis of connector 62. Thus, the operator may grip the element68 and depress lever 70 while turning the crank. The relative positionof lever 70 with respect to the operators hand will not change duringrotation of the crank.

Pivotal lever 70 has depending therefrom a camming ring 73 providing anose portion 74. As more clearly seen in FIG. 7, the camming ring 73 isgenerally annular in shape so that the connector 62 may be disposedwithin said ring. Thus, as

the lever 70 is pivoted about pin 80, the nose portion 74 of ring 73will abut the camming piston 54in an area immediately below theconnector 62 as may be seen in FIGS. 5 and 6. Since during rotation ofthe crank the lever 70 will rotate with respect to body 35, nose 74 ofring 73 may similarly rotate The operation of the driving device of thisinvention will now be described in detail with reference to FIGS. 5 and6. FIG. 6 shows the normal position of the camming piston 54 and thepivotal lever '70 in-the absence of the application of any externalforce to the lever 70. Thus, the compression spring 61 interposedbetween the shoulder 63 and a radial wall of the camming piston 54tendsto bias the camming piston away from the shoulder 63. With the cammingpiston 54 biased to the right as shown in FIG. 6, the lever 70 willassume an outwardly pivoted position with reference to the externalsurface of the cylindrical element 68. Upon application to lever 70 offorces about pin 80, the lever will pivot into recess 69. Thus, throughthe action of nose 74 the camming piston 54 will be moved to the left(as seen in FIG. 5). Movement of camming piston 54 to the left producesan upward movement of the cylindrical pin 43 as the frustoconicalcamming surface 58 moves along bevelled tip portion 75 of pin 43. As isshown in more clearly in FIG. 5, the lever 70 may be pivoted about pinuntil a stop portion 76 of lever 70 abuts the bottom of recess 69. Againwith reference to FIG. 5, an upward motion of the cylindrical pin 43imparts an upward motion to the entire linkage bringing teeth 50 of pawl49 into recesses 42 of cylinder 40 thereby to lock cylinder 40 againstrotation with respect to body 35.

In the position of FIG. 5, therefore, a rotation of the handle grip 66and the body 35 about the axis of the cylinder 40 will produce rotationof the cylinder 40 inasmuch as the cylinder is locked to the body 35.Conversely, a rotation of the handle grip 66 and body 35 about the axisof the cylinder 40 will not produce a rotation of cylinder 40 with thepivotal lever 70 in the position of FIG. 6 since teeth 50 are notreceived in recesses 42 and the cylinder 40 is therefore not locked tothe crank body.

'70 that the camming-piston 54 is brought into camming engagement withthe cylindrical pin 43 to move the teeth 50 into the recesses 42 thuspositively to lock cylinder 40 with respect to body 35.

The application of the driving device of this invention to a tubebending tool will now be described with reference to FIG. 1.

As was previously pointed out, the crank shaft 19 of the tube bendingtool is nonrotatably received within a recess of the cylinder 40 of thecrank arm 22. However, in the absence of an external force, the pivotallever 70 of the handle grip 66 assumes the position of FIG. 6 due to thecompression springs 45 and 61. Thus, the teeth 50 of the pawl 49 in FIG.1 are not received within recesses 42 of the cylinder 40. As a result,the cylinder 40 is free to rotate with the crankshaft 19 independentlyof the body 35 of the crank arm 22. Alternately, the body 35 of thecrank arm 22 is free to rotate with respect to the cylinder 40. As aresult, under the influence of gravity, crank arm 22 will be normallypositioned as shown in FIG. 1. The position of the crank arm 22 of FIG.1 is considered desirable because it does not interfere with the normaloperations involving the placing of tubes within the tube bender.

During the setting-up operation, prior to the actual bending of the tubeitself, the operator may freely rotate the forming roll 28 by handwithout producing a similar rotation of the crank arm 22. While rotationof the forming roll 28 will produce rotation of gears 18 and 17, andcrankshaft 19, the cylinder 40 is free to rotate with respect to thebody 35 of the crank arm 22. Because of inertia effects, the crank arm22 will retain the position of FIG. 1 in spite of manual rotation of theforming roll 28 prior to positioning of the tube in place. When it isdesired to complete a bend, the operator merely depresses the pivotallever 70 of the handle grip 66 and rotates the crank arm about the axisof the crankshaft l9. Depressing the pivotal lever 70 moves the teeth 50of pawl 49 into recesses 42 of cylinder 40 thus locking the cylinderagainst rotation with respect to the body 35 of the crank arm 22.Rotation of the crank arm about the axis of the crankshaft 19 with lever70 depressed imparts a rotary motion to crankshaft l9, gears 17, 18 andthe forming roll 28. Upon completion of the desired bend, the operatormerely releases the pivotal lever 70 thereby disengaging teeth 50 ofpawl 49 from the walls of cylinder 40 defining the recesses 42. Havingreleased the pivotal lever 70, the operator then releases the handlegrip 66 permitting the crank arm 22 to freewheel about the stationarycrankshaft 19 (under the influence of gravity), thus to assume theposition of FIG. 1.

Accordingly, the driving device of applicants invention, as applied to acrank arm for use in a tube bending tool, has a number of advantagesheretofore unknown in the art. Crank arm 22 is always freewheelingexcept when the pivotal lever 70 is positively depressed by theoperator. The crank arm 22 will thus always assume the position of FIG.1 regardless of the orientation of the crankshaft 19. The crank armtherefore is less likely to interfere with normal functions attendant tothe placing of tubing in position for bending, and the release of tubingafter completion of the bend. Since the crank arm is always freewheelingwith respect to the crankshaft 19, the operator may, at any time,manually adjust the forming roll 28 without rotating the crank arm.

In the event that it is inconvenient to rotate the crankshaft 19 inorder to complete a bend, the crank arm 22 may be removed from the endof the crankshaft l9 and positioned on surface 29 ofstub shaft 23.

ASSEMBLY OF THE INVENTION A brief description of the assembly ofapplicants driving device will now be made with reference to FIG. 5. Thecompression spring 61 and camming piston 54 is first disposed about theconnector 62. Connector 62 is thereafter secured to element 68 of handlegrip 66 by means of fastener 67.

With cover 52 removed, the cylinder 40, pawl 49 and carrier 47 aredisposed within counterbore 39. Spring 45 is next placed overcylindrical pin 43 and the latter is inserted into counterbore 37 ofbody 35 through access hole 77. Upon engagement of the cylindricalprojection 44 with the carrier 47, the cylindrical pin 43 is rotated toadvance threads 46 into carrier 47. Rotation may be imparted to thecylindrical pin43 by either a screwdriver inserted through access hole77 into engagement with a suitable slot (not shown) in the free end ofpin 43 or by an Allen wrench inserted in access hole 77 to engage asuitable recess of the pin.

The free end of connector 62 is then inserted in bore 64 of body 35until shoulder 63 abuts an internal wall surface of body 35. A washer 65and fastener 64a are then inserted into place to hold shoulder 63 firmlyagainst the internal wall surface of body 35.

ADVANTAGES OF THE INVENTION Applicants driving device offers a number ofadvantages heretofore unknown to the art. Applicants articulated carrierand pawl permits a smooth interengagement of the pawl teeth and therecesses of the rotating cylinder. The annular camming piston isslidably received in and supported by the walls defining the counterbore56 of body 35. Further, the annular camming piston 54 is slidablysupported by the connector element 62 permitting the connector elementand handle grip to rotate with respect to the piston. Thus, a lostmotion connection is established between lever 70 and pin 43 allowingthe operator to conveniently hold the handle grip and actuate lever 70while rotating the entire crank assembly. The

axis of the annular camming piston is normal to the axis of thecylindrical pin 43 thereby imparting a high mechanical advantage to thehandle grip and pivotal lever 70. Further, because the camming ringabuts and annular piston below the connector element, the mechanicaladvantage of the pivotal lever is increased permitting sufficientmovement of the camming piston with a slight amount of rotation of thepivotal lever.

For ease of description, the principles of the invention have been setforth in connection with but a single illustrated embodiment showing animproved crank. It is not our intention that the illustrated embodimentnor the terminology employed in describing it be limiting inasmuch asvariations in these may be made without departing from the spirit of theinvention. Rather we desire to be restricted only by the scope of theappended claims. I

I claim: l. A driving device for imparting rotary motion to a drivenmember comprising:

a generally elongated body having a first and second end portion, arotatable cylinder disposed within said first end portion of said body,said cylinder including, a plurality of teeth defining recesses on theexternal surface thereof, and, means to engage a driven member innonrotatable relationship, an elongated shaft disposed within said bodyand extending generally from said first end portion to said second endportion, said shaft including, a toothed surface at one end thereofadapted to enter said recesses of said cylinder,

means to bias said shaft-toothed surface out of said recesses of saidcylinder,

piston means disposed within said second end portion of said body, andincluding,

a cam surface,

means to bias said cam surface away from said shaft,

handle grip means associated with said second end portion of said bodyand having an axis parallel to said piston means axis, said handle gripmeans being rotatable relative to said body andincluding,

a pivotal lever having a piston means-engaging portion adapted to movesaid piston means against said second recited bias means upon pivotingof said lever in a first direction to move said cam surface of saidpiston means into camming engagement with said shaft and thereby tobring said toothed surface into said recesses of said cylinder,

whereby rotation of said body about the axis of said cylinder willimpart rotary motion to a driven member engaged with said cylinder.

2. The invention of claim 1 in which said toothed surface is furtherdefined as a toothed element pivotally mounted to one end of said shaft.

3. The invention of claim 1 in which said body includes a bore and atleast one counterbore and said shaft is a generally cylindrical pinslidably received and supported within said counterbore, said pin havinga cylindrical projection slidably received and supported within saidbore.

4. The invention of claim 3 in which said cylindrical projection isscrew threadedly attached to said toothed surface.

5. The invention of claim 3 in which said first recited bias means isdefined as a compression spring disposed about said cylindricalprojection and abutting said cylindrical pin and the radial surface ofsaid body defining said counterbore.

6. A driving device for imparting rotary motion to a driven membercomprising:

a generally elongated body having a bore, a counterbore,

and a first and second end portion,

a rotatable cylinder disposed within said first end portion of saidbody, said cylinder including,

a plurality of teeth defining recesses on the external surface thereof,and

means to engage a driven member in nonrotatable relationship,

an elongated shaft disposed within said body and extending generallyfrom said first end portion to said second end portion,-said shaftincluding,

a toothed surface at one end thereof adapted to enter said recesses ofsaid cylinder,

means to bias said shaft toothed surface out of said recesses of saidcylinder,

piston means disposed within said second end portion of said body insaid counterbore, said piston means being defined by a substantiallycylindrical element having a bore, said cylindrical element including acylindrical shoulder of lesser diameter than said cylindrical elementand a frustoconical camming surface adjacent said shoulder, said pistonmeans reciprocable on an axis normal to the axis of said shaft, andincluding,

means to bias said camming surface away from said shaft,

handle grip means associated with said second end portion of said bodyand having an axis parallel to said piston means axis, said handle gripmeans including,

a pivotal lever having a piston means engaging portion adapted to movesaid piston means against said second recited bias means upon pivotingof said lever in a first direction to move said camming surface of saidpiston means into camming .engagement with said shaft and thereby tobring said toothed surface into said recesses of said cylinder,

whereby rotation of said body about the axis of said cylinde will impartrotary motion to a driven member engaged with said cylinder.

7. The invention of claim 6 in which said grip handle means is rotatablysecured to said body by a substantially cylindrical connector disposedwithin said bore of said cylindrical element and rotatably secured atone end thereof to said body and secured at the other end to said griphandle means.

8. The invention of claim 7 in which said pivotal lever includes a camring disposed about said connector and abutting said cylindricalelement.

9. The invention of claim 6 in which said second recited bias means isdefined as a compression spring disposed substantially within acounterbore of said cylindrical element and abutting said body.

10. The invention of claim 6 in which said shaft includes afrustoconical surface at the end thereof abutting said cylindricalelement.

11. A driving device for imparting rotary motion to a driven membercomprising:

with teeth adapted to enter recesses defined in the external surface ofsaid cylinder so as to lock said cylinder against rotation relative tosaid body when said pin is in a first position,

means to bias said pin away from said cylinder to a second positionwherein said teeth of said pin are clear of the recesses of saidcylinder,

a cylindrical piston reciprocably supported in said body adjacent saidhandle, the axis of said piston being parallel to the axis of saidhandle,

a cylindrical shoulder on said piston against which said pin is adaptedto abut,

a frustoconical camming surface on said piston adjacent said shoulder,

means to bias said camming surface away from said pin,

a pivotal lever carried by said handle, said lever including a cam ringadapted to abut said piston whereby pivotal movement of said leverproduces reciprocable movement of said piston bnngmg said cammingsurface into contact with said pin thereby moving said teeth into saidrecesses of said 12. A driving device for imparting rotary motion to adriven member comprising:

a body supporting a cylinder at one end thereof and a handle at theother end thereof, said cylinder and handle being rotatable relative tosaid body,

a passageway in said body,

a reciprocable pin disposed in said passageway,

the end of said pin adjacent said cylinder being provided with teethadapted to enter recesses defined in the external surface of saidcylinder so as to lock said cylinder against rotation relative to saidbody,

a pivotal lever carried by said handle,

lost motion interconnecting means between said pivotal lever and saidpin whereby pivotal movement of said lever produces linear movement ofsaid pin thereby moving said teeth into said recesses of said cylinder.

13. The invention of claim 12 in which said lost motion interconnectingmeans is defined as a substantially cylindrical piston received withinsaid body and having a frustoconical camming surface,

a piston means engaging portion extending from said pivotal lever andadapted to move said piston,

whereby upon pivoting of said lever said camming surface of said pistonmoves into camming engagement with said pin thereby to move said teethinto said recesses of said cylinder.

14. The invention of claim 13 in which said handle is secured to saidbody by a substantially cylindrical connector disposed within a bore ofsaid piston and rotatably secured at one end thereof to said body whilesecured at the other end thereof to said handle.

15. The invention of claim 14 in which said piston means engagingportion is defined as a cam ring disposed about said connector andadapted to abut said position.

1. A driving device for imparting rotary motion to a driven membercomprising: a generally elongated body having a first and second endportion, a rotatable cylinder disposed within said first end portion ofsaid body, said cylinder including, a plurality of teeth definingrecesses on the external surface thereof, and, means to engage a drivenmember in nonrotatable relationship, an elongated shaft disposed withinsaid body and extending generally from said first end portion to saidsecond end portion, said shaft including, a toothed surface at one endthereof adaptEd to enter said recesses of said cylinder, means to biassaid shaft-toothed surface out of said recesses of said cylinder, pistonmeans disposed within said second end portion of said body, andincluding, a cam surface, means to bias said cam surface away from saidshaft, handle grip means associated with said second end portion of saidbody and having an axis parallel to said piston means axis, said handlegrip means being rotatable relative to said body and including, apivotal lever having a piston means-engaging portion adapted to movesaid piston means against said second recited bias means upon pivotingof said lever in a first direction to move said cam surface of saidpiston means into camming engagement with said shaft and thereby tobring said toothed surface into said recesses of said cylinder, wherebyrotation of said body about the axis of said cylinder will impart rotarymotion to a driven member engaged with said cylinder.
 2. The inventionof claim 1 in which said toothed surface is further defined as a toothedelement pivotally mounted to one end of said shaft.
 3. The invention ofclaim 1 in which said body includes a bore and at least one counterboreand said shaft is a generally cylindrical pin slidably received andsupported within said counterbore, said pin having a cylindricalprojection slidably received and supported within said bore.
 4. Theinvention of claim 3 in which said cylindrical projection is screwthreadedly attached to said toothed surface.
 5. The invention of claim 3in which said first recited bias means is defined as a compressionspring disposed about said cylindrical projection and abutting saidcylindrical pin and the radial surface of said body defining saidcounterbore.
 6. A driving device for imparting rotary motion to a drivenmember comprising: a generally elongated body having a bore, acounterbore, and a first and second end portion, a rotatable cylinderdisposed within said first end portion of said body, said cylinderincluding, a plurality of teeth defining recesses on the externalsurface thereof, and means to engage a driven member in nonrotatablerelationship, an elongated shaft disposed within said body and extendinggenerally from said first end portion to said second end portion, saidshaft including, a toothed surface at one end thereof adapted to entersaid recesses of said cylinder, means to bias said shaft toothed surfaceout of said recesses of said cylinder, piston means disposed within saidsecond end portion of said body in said counterbore, said piston meansbeing defined by a substantially cylindrical element having a bore, saidcylindrical element including a cylindrical shoulder of lesser diameterthan said cylindrical element and a frustoconical camming surfaceadjacent said shoulder, said piston means reciprocable on an axis normalto the axis of said shaft, and including, means to bias said cammingsurface away from said shaft, handle grip means associated with saidsecond end portion of said body and having an axis parallel to saidpiston means axis, said handle grip means including, a pivotal leverhaving a piston means engaging portion adapted to move said piston meansagainst said second recited bias means upon pivoting of said lever in afirst direction to move said camming surface of said piston means intocamming engagement with said shaft and thereby to bring said toothedsurface into said recesses of said cylinder, whereby rotation of saidbody about the axis of said cylinder will impart rotary motion to adriven member engaged with said cylinder.
 7. The invention of claim 6 inwhich said grip handle means is rotatably secured to said body by asubstantially cylindrical connector disposed within said bore of saidcylindrical element and rotatably secured at one end thereof to saidbody and secured at the other end to said grip handle means.
 8. Theinvention of claim 7 in which said pivotal lever includes a cam ringdisposed about said connector and abutting said cylindrical element. 9.The invention of claim 6 in which said second recited bias means isdefined as a compression spring disposed substantially within acounterbore of said cylindrical element and abutting said body.
 10. Theinvention of claim 6 in which said shaft includes a frustoconicalsurface at the end thereof abutting said cylindrical element.
 11. Adriving device for imparting rotary motion to a driven membercomprising: a body supporting a rotatable cylinder at one end thereof,the other end of the body including a handle extending from the bodyalong an axis parallel to the axis of said rotatable cylinder, aninternal passageway in said body extending between the opposite endsthereof, a reciprocable pin disposed in said passageway, the end of saidpin adjacent said cylinder being provided with teeth adapted to enterrecesses defined in the external surface of said cylinder so as to locksaid cylinder against rotation relative to said body when said pin is ina first position, means to bias said pin away from said cylinder to asecond position wherein said teeth of said pin are clear of the recessesof said cylinder, a cylindrical piston reciprocably supported in saidbody adjacent said handle, the axis of said piston being parallel to theaxis of said handle, a cylindrical shoulder on said piston against whichsaid pin is adapted to abut, a frustoconical camming surface on saidpiston adjacent said shoulder, means to bias said camming surface awayfrom said pin, a pivotal lever carried by said handle, said leverincluding a cam ring adapted to abut said piston whereby pivotalmovement of said lever produces reciprocable movement of said pistonbringing said camming surface into contact with said pin thereby movingsaid teeth into said recesses of said
 12. A driving device for impartingrotary motion to a driven member comprising: a body supporting acylinder at one end thereof and a handle at the other end thereof, saidcylinder and handle being rotatable relative to said body, a passagewayin said body, a reciprocable pin disposed in said passageway, the end ofsaid pin adjacent said cylinder being provided with teeth adapted toenter recesses defined in the external surface of said cylinder so as tolock said cylinder against rotation relative to said body, a pivotallever carried by said handle, lost motion interconnecting means betweensaid pivotal lever and said pin whereby pivotal movement of said leverproduces linear movement of said pin thereby moving said teeth into saidrecesses of said cylinder.
 13. The invention of claim 12 in which saidlost motion interconnecting means is defined as a substantiallycylindrical piston received within said body and having a frustoconicalcamming surface, a piston means engaging portion extending from saidpivotal lever and adapted to move said piston, whereby upon pivoting ofsaid lever said camming surface of said piston moves into cammingengagement with said pin thereby to move said teeth into said recessesof said cylinder.
 14. The invention of claim 13 in which said handle issecured to said body by a substantially cylindrical connector disposedwithin a bore of said piston and rotatably secured at one end thereof tosaid body while secured at the other end thereof to said handle.
 15. Theinvention of claim 14 in which said piston means engaging portion isdefined as a cam ring disposed about said connector and adapted to abutsaid position.